Presentation on theme: "ANATOMY OF THE LARGE INTESTINE"— Presentation transcript:
1 ANATOMY OF THE LARGE INTESTINE Dr. Ahmed Fathalla IbrahimAssociate Professor of AnatomyCollege of MedicineKing Saud UniversityDr. Jameela Al-MedanyAssociate Professor of AnatomyCollege of MedicineKing Saud University
2 OBJECTIVES At the end of the lecture, students should: List the different parts of large intestine.List the characteristic features of colon.Describe the anatomy of different parts of large intestine regarding: the surface anatomy, peritoneal covering, relations, arterial & nerve supply.
3 PARTS OF LARGE INTESTINE CECUMAPPENDIXASCENDING COLONTRANSVERSE COLONDESCENDING COLONSIGMOID COLONRECTUMANAL CANALAbdomenABDOMENPELVISPelvisPERINEUMPerineum
5 CHARACTERISTICS OF COLON (NOT FOUND IN RECTUM & ANAL CANAL) Teniae coli: 3 longitudinal muscle bandsSacculations (haustra): teniae coli are shorter than large intestineEpiploic Appendices : short peritoneal fold filled with fat
6 PERITONEAL COVERING PARTS WITH MESENTERY: Transverse colon Sigmoid colonAppendixCecumRETROPERITONEAL PARTS:Ascending colonDescending colon
7 PERITONEAL COVERING RETROPERITONEAL PARTS 3. Upper 2/3 of rectum PARTS DEVOID OF PERITONEAL COVERING:Lower 1/3 of rectumAnal canalRectumAnalcanal
8 SURFACE ANATOMY ASIS Left hypochondrium Right hypochondrium EpigastriumRight lumbar regionUmbilical regionLeft lumbar region2/3McBurney’s point1/3ASISHypogastriumLeft iliac fossaRight iliac fossa
9 Surface anatomy: the base of appendix is marked by Mc’Burney’s point: A point at the junction of lateral 1/3 & medial 2/3 of a line traced from right anterior superior iliac spine to umbilicusOpening: at posteromedial aspect of cecum, 1 inch below ileo-cecal junctionPositions:1.Retrocecal: most common2.Pelvic3.Subcecal4.Preilieal5.Postileal: least commonAPPENDIX(4)(5)(1)(2)(3)
16 RECTUM Beginning: as a continuation of sigmoid colon at level of S3. Termination: continues as anal canal, one inch below & in front of tip of coccyx. Its end is dilated to form the rectal ampulla.Length: 13 cm(5 inches)
17 RELATIONS OF RECTUM IN PELVIS MALE PELVISAnterior: seminal vesicles, posterior surfaces of urinary bladder & prostate glandPosterior: sacrum & coccyxFEMALE PELVISAnterior: posterior wall of vaginaPosterior: sacrum & coccyxRR
18 QUESTION 1Which one of the following is the most common position of appendix?SubcecalRetrocecalPelvicPreileal
19 QUESTION 2Regarding the transverse colon, which one of the following statements is correct?It is only supplied by the superior mesenteric artery.It has no mesentery.It lies behind the pancreas.It contains taeniae coli in its wall.